Question

what can happen when a virus mutates? it loses its genetic code it stops reproducing it gains the ability to infect a new host species it becomes visible to the naked eye

Explanation:

When a virus mutates, it can change its characteristics. Losing genetic code (vital for replication) and stopping reproduction (core function) are unlikely. Viruses are microscopic, so visibility to the naked eye is impossible. However, mutation can alter surface proteins, enabling infection of new host species (e.g., animal - to - human jumps like some coronaviruses).

Answer:

It gains the ability to infect a new host species.